Android Question Combine 4x2 imageviews into 1 Jpeg

[imbault]

Hi,
I need to take 8 photos then combine them into 1 photo;

So I will create 4x2 Imageviews side to side, but how to combine that into 1 one Jpeg file?

Any ideas?

Thanks

Patrick

 

[MarkusR]

i believe u can do this with this jpeg library.
https://www.b4x.com/android/forum/threads/jpeg-library.6779/#content

 

[Erel]

Use Canvas.DrawBitmap to draw each of the bitmaps (on the same canvas). Each one in the correct place.

 

[imbault]

Ok thanks Erel, I will have that mosaic with each Canvas.DrawBitmap, but how to save that mosaic into one single file?

Thanks
Patrick

 

[DonManfred]

Try

' out = outputstream
' c = canvas
 Out = File.OpenOutput(File.DirRootExternal & "/Images/", "IMG_20178108230.jpg", False)
    C.Bitmap.WriteToStream(Out, 100, "JPEG")
    Out.Close

 

[imbault]

Thank you @DonManfred , but I want to save a mosaic of 4x2 canvas into one single file

 

[DonManfred]

Draw all of rhem on one canvas and save this canvas

 

[JordiCP]

As DonManfred says, it would be something like this (not tested, syntax errors allowed )

Dim myBitmap(8) as Bitmap
' ... init them

Dim scaleFactor as Float=1   ' or whatever
Dim W as int = scaleFactor*myBitmap(0).Width   ' We are assuming that all bitmaps have equal dimensions.
Dim H as int = scaleFactor*myBitmap(0).Height

Dim totalW as int = 4*W    ' Total width of 4*2 mosaic
Dim totalH as Int = 2*H     ' Total height ...

Dim b as Bitmap
b.initializeMutable(totalW,totalH)
Dim cv as Canvas
cv.initialize2(b)
for r=0 to 1
  for c=0 to 3
    Dim dstRect as Rect
    dstRect.initialize(c*W, r*H, (c+1)*W, (r+1)*H)     '<-- each bitmap will be in a position in the mosaic. No spacing between bitmaps here
    cv.drawBitmap( myBitmap(4*r+c), Null, dstRect)
  next
next

' Now you have your bitmap in b and also in cv.bitmap. Can be saved to jpeg
Dim o As OutputStream
o=File.OpenOutput( Dir_dest, Filename_dest,False)
cv.Bitmap.WriteToStream(o,100,"JPEG")    'or "PNG"  
o.Close

 

[imbault]

@JordiCP, I owe you a beer and I will, send me you email by PM in order to paypal some $, I didn't try but it looks good

Thanks

 

[JordiCP]

No need, I'm already taking too many beers because of the summer heat

 

[asales]

Maybe you can put the 8 imageviews in a panel and use the function Snapshot from B4XView to capture and save the image in JPEG.

See my example in attach.

 

[imbault]

Thank you very much @asales, I'll try

what a beer, to?

Regards

Patrick

 

[asales]

Thank you very much @asales, I'll try

what a beer, to?

Regards

Patrick

No need, I'm fine. But thank you.